Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d6d70f0edef4a5…

MALICIOUS

PDF

78.3 KB Created: 2021-10-05 06:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 491458d8f82fb04341471ddfcc2774df SHA-1: fd47685e25e2a443dc9f38b3233dd177fcf0fa69 SHA-256: 93d6d70f0edef4a52c05548fd7eb307c74ad27c8ae75bbd301d0b51314c39d20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links points to a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=eve+moon+mining+guide PDF link annotation
    • http://bukharasuwanee.com/sites/default/files/file/70484801204.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xerizazezovutuvefopipo.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///ritijixenupukegexoze.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/fexupudageja.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/fenidagujavofofowifesaso.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b225a7b76e---96145797131.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/18421286524.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/57879585311.pdfIn PDF document text
    • http://bionazorat.uznature.uz/userfiles/file/suxinamujugivedig.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/96771094034.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/sudekozedomiwowevedufit.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/mewipezatenoweb.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b98640b924---47354886198.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/1510403372.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/buzuxuvurafegopuwufutere.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/9538186984.pdfIn PDF document text
    • https://dalba.net/other_files/File/fexixobilutusarawalawux.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/kafupomegajenif.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gowusativejosivo.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/sasipugetepu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 17276 bytes
SHA-256: 1739817857cb16b8331a84f7e212d94b750be236a62aadde243dd915cd31b0ee
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 10168 bytes
SHA-256: 269c18f540c8310f1f6ea19d114f8861ef6a3481e16dc5a478a4532e38a7eaf8
font_02_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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